Nanotechnology Now

Our NanoNews Digest Sponsors
Heifer International



Home > Press > Observation charge accumulation at nanocavity on plasmonic photocatalyst

SCHEMATIC ILLUSTRATION OF AU DIMERS/TIO2 TO SIMULATE THE PHOTOSYSTEM II AND PLASMONIC CHARGE ACCUMULATION AT NANOCAVITY FOR WATER OXIDATION.

CREDIT
©Science China Press
SCHEMATIC ILLUSTRATION OF AU DIMERS/TIO2 TO SIMULATE THE PHOTOSYSTEM II AND PLASMONIC CHARGE ACCUMULATION AT NANOCAVITY FOR WATER OXIDATION. CREDIT ©Science China Press

Abstract:
Strong interaction between plasmonic nanoparticles and free-space light induced the evanescently confined modes on the nanoparticle surfaces, which holds great promise in plasmonic nanophotonic technologies. Plasmonic nanoparticle with the capability of generating energetic charges makes it being widely exploited in the field of photocatalysis, providing a new paradigm for conversion renewable sunlight to useful fuels and high-value chemicals.

Observation charge accumulation at nanocavity on plasmonic photocatalyst

Beijing, China | Posted on August 28th, 2020

Plasmon metal nanoparticles/semiconductors with Schottky barrier at interface are well-received photocatalysts that can achieve charge spatial separation to prolong the lifetime of separating charge for matching the timescale of surface chemical reactions. The key question in the plasmonic photocatalysis is how plasmonic charges can be effectively separated to improve charge density at catalytic sites, which is critical to multi-hole/electron-driven redox reactions, such as water oxidation.

In natural photosynthesis, hundreds of functional pigments are distributed surrounding a reaction center of photosystem II to continuously supply photogenerated charges by increasing the light absorption flux. However, due to the lack of microscopic details of charge accumulation sites in artificial photosynthesis, there is less report for mimicking natural photosynthesis to extract sufficient hot holes in plasmonic photocatalysts for efficient oxygen evolution.

In a new research article published in the Beijing-based National Science Review, inspired by natural photosynthesis, Can Li and Fengtao Fan research group from Dalian Institute of Chemical Physics, Chinese Academy of Sciences, present an elegant approach to simultaneously address the critical problems of light harvesting and charge density at catalytic sites of plasmonic photocatalyst. The group constructed Au nanoparticle dimers on TiO2 as optical antenna, and found charge accumulation at nanocavity of Au dimers/TiO2 photocatalyst mediated by surface plasmon resonance coupling. Combining experimentally measured surface photovoltage with theoretical calculations, the local density of hot hole was demonstrated to be related to the square of local near-field intensity. Using four-electron involved water oxidation reaction as a probe reaction, the performance of Au dimer/TiO2 photoanode can be improved by one order of magnitude compared to Au NPs/TiO2 photoanode.

The current work presents a previously unrecognized effect on charge accumulation at catalytic sites of plasmonic photocatalysts. Furthermore, it should encourage others to explore the significance of plasmonic hot spot to generate more charges - not only for photodetections, but also for photocatalysis associated with multiple charges transfer processes.

###

This research received funding from the National Natural Science Foundation of China, the Chinese Academy of Sciences Interdisciplinary Innovation Team, Dalian Institute of Chemical Physics Innovation Foundation, and the Strategic Priority Research Program and Equipment Development Project of the Chinese Academy of Sciences.

####

About Science China Press
The National Science Review is the first comprehensive scholarly journal released in English in China that is aimed at linking the country's rapidly advancing community of scientists with the global frontiers of science and technology. The journal also aims to shine a worldwide spotlight on scientific research advances across China.

For more information, please click here

Contacts:
Yan Bei

Copyright © Science China Press

If you have a comment, please Contact us.

Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.

Bookmark:
Delicious Digg Newsvine Google Yahoo Reddit Magnoliacom Furl Facebook

Related Links

See the article:

Related News Press

News and information

The National Space Society Congratulates Blue Origin and Jeff Bezos for the Spectacular First Crewed Flight of the New Shepard: Well-Tested Suborbital Tourist Rocket Soars to 63 Miles; Opens New Frontiers July 21st, 2021

Unconventional superconductor acts the part of a promising quantum computing platform: If it looks like a duck, swims like a duck and quacks like a duck, then it probably is a duck. July 16th, 2021

Unlocking efficient light-energy conversion with stable coordination nanosheets: Scientists design a high-performance, self-powered, UV photodetector using 2D nanosheets that show record photocurrent stability under air exposure July 16th, 2021

The virus trap: Hollow nano-objects made of DNA could trap viruses and render them harmless July 16th, 2021

Primers with graphene nanotubes offer a new solution for electrostatic painting of automotive parts July 16th, 2021

Chemistry

RUDN University chemists obtained an unusual planar nickel complex exhibiting magnetic properties July 16th, 2021

Emergence of a new heteronanostructure library May 14th, 2021

Researchers analyzed circulating currents inside gold nanoparticles: A new method facilitates accurate analysis of magnetic field effects inside complex nanostructures April 30th, 2021

Plasmonics

TPU scientists offer new plasmon energy-based method to remove CO2 from atmosphere March 19th, 2021

USTC develops ultrahigh-performance plasmonic metal-oxide materials January 11th, 2021

Experiment takes 'snapshots' of light, stops light, uses light to change properties of matter December 25th, 2020

Making quantum 'waves' in ultrathin materials: Study co-led by Berkeley Lab reveals how wavelike plasmons could power up a new class of sensing and photochemical technologies at the nanoscale May 15th, 2020

Govt.-Legislation/Regulation/Funding/Policy

The virus trap: Hollow nano-objects made of DNA could trap viruses and render them harmless July 16th, 2021

Scientists create rechargeable swimming microrobots using oil and water July 16th, 2021

Scientists take first snapshots of ultrafast switching in a quantum electronic device: They discover a short-lived state that could lead to faster and more energy-efficient computing devices July 16th, 2021

Stress-free path to stress-free metallic films paves the way for next-gen circuitry: Optimized sputtering technique helps minimize stress in tungsten thin films July 4th, 2021

Possible Futures

The National Space Society Congratulates Blue Origin and Jeff Bezos for the Spectacular First Crewed Flight of the New Shepard: Well-Tested Suborbital Tourist Rocket Soars to 63 Miles; Opens New Frontiers July 21st, 2021

Scientists create rechargeable swimming microrobots using oil and water July 16th, 2021

Scientists take first snapshots of ultrafast switching in a quantum electronic device: They discover a short-lived state that could lead to faster and more energy-efficient computing devices July 16th, 2021

Researchers discover a new inorganic material with lowest thermal conductivity ever reported July 16th, 2021

Discoveries

Repairs using light signals: FAU research group develops smart microparticle that identifies defective parts in electrical appliances July 16th, 2021

Removing the lead hazard from perovskite solar cells July 16th, 2021

Scientists create rechargeable swimming microrobots using oil and water July 16th, 2021

Scientists take first snapshots of ultrafast switching in a quantum electronic device: They discover a short-lived state that could lead to faster and more energy-efficient computing devices July 16th, 2021

Announcements

The National Space Society Congratulates Blue Origin and Jeff Bezos for the Spectacular First Crewed Flight of the New Shepard: Well-Tested Suborbital Tourist Rocket Soars to 63 Miles; Opens New Frontiers July 21st, 2021

Scientists create rechargeable swimming microrobots using oil and water July 16th, 2021

Scientists take first snapshots of ultrafast switching in a quantum electronic device: They discover a short-lived state that could lead to faster and more energy-efficient computing devices July 16th, 2021

Researchers discover a new inorganic material with lowest thermal conductivity ever reported July 16th, 2021

Interviews/Book Reviews/Essays/Reports/Podcasts/Journals/White papers/Posters

RUDN University chemists obtained an unusual planar nickel complex exhibiting magnetic properties July 16th, 2021

Repairs using light signals: FAU research group develops smart microparticle that identifies defective parts in electrical appliances July 16th, 2021

Scientists create rechargeable swimming microrobots using oil and water July 16th, 2021

Scientists take first snapshots of ultrafast switching in a quantum electronic device: They discover a short-lived state that could lead to faster and more energy-efficient computing devices July 16th, 2021

NanoNews-Digest
The latest news from around the world, FREE




  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More











ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project